Spout for flexible thin-walled packagings

ABSTRACT

A thin-walled flexible package ( 1 ) is provided with a spout ( 6 ) comprising a connection portion ( 12 ) and a tube ( 18 ) having an outer surface ( 18   e ) and ending with an outlet mouth ( 20 ). A sacrificial closure ( 200 ) is applied to the spout ( 6 ) to close the outlet mouth ( 20 ). The sacrificial closure ( 200 ) comprises a skin ( 202 ) suitable for sealing engaging the outer surface ( 18   e ) of the tube ( 18 ) at a scaling region having a scaling distance (H) from the outlet mouth ( 20 ). On the outer surface ( 18   e ) of the tube ( 18 ) there is a circumferential dividing line (L 2 ) having a division distance (H 2 ) from the outlet mouth ( 20 ). The scaling distance (H) is less than the division distance (H 2 ).

The present invention relates to the field of flexible thin-walledpackagings, in jargon called “pouches,” typically provided with a spoutprovided with a cap. Such packagings are widely used to contain productssuch as fruit juices, fruit or vegetable puree, yogurt, drinks, creams,honey, mostly intended for consumption by children.

The sterilization of these packagings has enormous importance for theprevention of infections and the correct preservation of the productcontained therein.

Sometimes, chemical sterilization is carried out, during which thepackaging is washed with disinfectant agents, for example hydrogenperoxide, and then dried, before being sent to subsequent fillingoperations. However, chemical sterilization has some drawbacks such as,for example, the presence of residues of the disinfectant agent in thedry container or the presence of non-disinfected areas due to complex orirregular geometries of the packaging. This drawback is particularlyfelt in the pouch sector.

A significant diffusion in the sector, on the other hand, issterilization by ionizing radiation, such as gamma rays or electronbeams. For example, the Applicant is the owner of the InternationalApplications WO-A1-2012/147007 and WO-A1-2012/147008.

Usually, the sterilization by ionizing radiation is carried out inspecialized centers, to which the packaging manufacturer sends thepackagings to be treated; after sterilization, the sterile packages aresent to the person who carries out the filling and the application ofthe closure, using measures that allow the maintenance of the sterilitycondition inside the packaging. Such logistics obviously implyconsiderable transport costs between the sites and a considerablecomplexity of managing the packagings within the sites themselves.

To overcome this drawback, the Applicant has already devised a systemfor managing the sterilization of flexible thin-walled packagings inwhich the use of a plurality of sacrificial closures applied to thespout outlet mouth before sterilization is provided, subsequentlyseparated from the spout in a sterile chamber, just before filling thepackaging. This system is illustrated in International ApplicationsWO-A1-2017/001947 and WO-A1-2017/168322.

As may be understood, in order for this system to be fully effective,the application of the sacrificial closure to the spout outlet mouthshould ensure air tightness, in order to prevent the interior of thepackaging from being contaminated before filling it in the sterilechamber.

The object of the present invention is to provide a spout for a flexiblethin-walled packaging which is particularly effective for theapplication of a sacrificial closure.

Such an object is achieved by a spout according to claim 1. Thedependent claims describe further advantageous embodiments of theinvention.

The features and the advantages of present invention will appear moreclearly from the following description, made by way of an indicative andnon-limiting example with reference to the accompanying figures, inwhich:

FIG. 1 shows an assembly comprising a flexible packaging and asacrificial closure, according to an embodiment of the presentinvention;

FIG. 2a shows a spout according to an embodiment of the presentinvention, with sacrificial closure applied;

FIG. 2b shows the spout of FIG. 2a , with separate sacrificial closure;

FIG. 3 shows a cross-sectional view of the spout of FIG. 2 a;

FIG. 4 shows a sacrificial closure, according to an embodiment of thepresent invention;

FIG. 5a shows the spout according to the present invention, according toa side view;

FIG. 5b shows the spout of FIG. 5a , according to a cross-sectionalview; and

FIG. 6 shows a diagram of a mold for making the spout according to anembodiment of the present invention.

With reference to the accompanying drawings, reference numeral 1indicates a flexible thin-walled packaging, comprising a packaging body2, comprising thin walls 4 facing each other, and a spout 6, sealinglyfixed, preferably by welding, between the thin walls 4 of the packagingbody 2.

The packaging 1 is provided with a sacrificial closure 200 applied tothe outlet mouth of the spout 6.

According to a first embodiment, the sacrificial closure 200 is appliedreversibly to the spout 6, that is, so that it may be separated from thespout to have access to the outlet mouth; for example, said sacrificialclosure is a cap applied by pressure to the spout and separable from it.

According to a further embodiment, the sacrificial closure 200 isirreversibly applied to the spout, i.e. in such a way that it must be atleast partially torn to allow access to the outlet mouth; for example,said sacrificial closure is a cap applied by pressure to the spout so asnot to be removable and comprises a tear-resistant membrane.

According to the sterilization process, a packaging 1 is produced on aproduction site.

Subsequently, the sacrificial closure 200 is applied to the emptypackaging 1, preferably at the production site.

The empty packaging—sacrificial closure assembly, for example afterbeing transported from the production site to a sterilizationsite—undergoes a sterilization process, typically by ionization by gammaor beta rays, obtaining a sterilized assembly.

According to an alternative embodiment, the sacrificial closure 200 isapplied to the spout 6 at the sterilization site, however, beforecarrying out the sterilization process.

The sterilized assembly, preferably after being transported to a fillingsite, is sent to a filling machine, where at least part of the spout 6passes through a sterile chamber.

In said sterile chamber, the sacrificial closure 200 is tampered with soas to access the outlet mouth of the spout 6.

The packaging 1 is then filled through the outlet mouth of the spout.

If the sacrificial closure 200 is irreversibly applied to the spout 6,said sacrificial closure 200 is at least partially torn, for example bybreaking a surface membrane; the packaging 1 is then filled through theoutlet mouth of the spout.

Subsequently, according to an embodiment of the invention, while thefull packaging is still in the sterile chamber, a definitive closure,for example a cap with a thread, is applied to the spout 6; in this waya filled packaging—final closure assembly for marketing is obtained.

According to an alternative embodiment, while the full packaging isstill in the sterile chamber, a temporary closure is applied to thespout, for example consisting of the sacrificial closure; a filledpackaging—temporary closure assembly is thus obtained, to which thedefinitive closure is subsequently applied outside the sterile chamber.According to such embodiment variant, the definitive closure is suitablefor engaging with the temporary closure, so that, once the definitiveclosure has been removed, the temporary closure is also removed from thespout.

The spout 6 extends mainly along a main axis X, between a lower end 8and an upper end 10.

At the lower end 8, the spout 6 comprises a connecting portion 12,usually defined as a “welding boat”, intended for welding between thethin walls 4 of the packaging body 2.

Preferably, the spout 6 further comprises a lower plate 14, whichextends on an imaginary plane orthogonal to the main axis X, adjacent tothe connecting portion 12, and an upper plate 16, parallel to andseparated from the lower plate 14.

The spout 6 further comprises a tube 18, provided with an outer surface18 e, which protrudes from the upper plate 16 and extends to the upperend 10, where there is an outlet mouth 20.

On the outside of the tube 18 a thread 22 is preferably provided forscrewing the final closure.

Internally, the spout 6 has a through dispensing duct 24 which extendsfrom the outlet mouth 20 to the lower end 18, having a central axiscoinciding with the main axis X of the spout 6.

The sacrificial closure 200 comprises a skirt 202 consisting of anannular wall having a predefined axial height, provided with an innerdiameter such as to allow said skirt to be fitted on the outer surfaceof the tube 18.

Preferably, the skirt 202 comprises a seal 204 consisting of a lipprotruding radially internally, suitable for achieving an airtight sealby adhering to the outer surface of the tube 18.

Furthermore, the sacrificial closure 200 comprises a base 204 whichcloses the skirt 202 at the top; in the embodiment in which thesacrificial closure is irreversible, said base 204 is a tearablemembrane.

The spout 6 is made of a single piece of plastics material, preferablyby injection molding.

In particular (FIGS. 5a and 5b ), the spout 6 consists of two portions:a first portion 602, comprising the connecting portion 12, eventuallythe lower plate 14 and the upper plate 16, and a lower portion 182 ofthe tube 18, and a second portion 604 comprising an end portion 184 ofthe tube 18, provided with the outlet mouth 20.

The spout 6 is obtained in a single piece by injection molding, usingfor example a mold assembly 300 (FIG. 6).

The mold assembly 300 comprises a first half-mold 302 having a firsthalf-cavity 302 a and a second half-mold 304 having a second half-cavity304 a. The two half-molds 302, 304 come into contact with each other ona first contact plane P1, so that the two half-cavities 302 a, 304 aform a first cavity.

The first portion 602 of the spout is obtained by filling the firstcavity. At said first contact plane P1, on the first portion 602 of thespout 6 it is possible to see a first dividing line L1.

Preferably, said first dividing line L1 is contained on an imaginaryplane which also contains said main axis X.

The mold assembly 300 further comprises an annular insert 306, having asecond cavity 306 a which has complete annular extension; the insert 306couples with the two half-molds 302, 304 so that the second cavity 306 ais arranged astride the two half-molds 302, 304 and is joined to thefirst cavity.

The second portion 604 is obtained by filling the second cavity 306 a.

At the connection between the first portion 602 and the second portion604, a second circumferential dividing line L2 may be seen, having apredefined distance H2 from the outlet mouth 20.

The second dividing line L2 lies on an imaginary plane P2 orthogonal tothe main axis X.

Furthermore, between the first portion 602 and the second portion 604,on the outer surface 18 e of the tube 18, a smooth annular band 606 isdefined, free of any flanges, projections, protrusions and the like.

The second dividing line L2 is contained in said band 606, dividing itinto an upper band 606 a, towards the outlet mouth 20, and a lower band606 b, on the opposite side.

Finally, the mold assembly 300 comprises a male element 308 whichcrosses the insert 306 and passes through the second cavity 306 a andthrough the first cavity, so as to create the inner cavity of the spout.

The skirt 202 of the sacrificial closure 200 cooperates with the outersurface 18 e of the tube 18 to seal the inlet mouth, along a sealingregion having an axial distance H from said outlet mouth 20, whereinsaid sealing distance H is less than or equal to said division distanceH2 between the second dividing line L2 and the outlet mouth 20.

In other words, the sacrificial closure 200 engages the tube 18 only atthe second portion 604, i.e. only on the outer surface of the endportion 184 of the tube 18.

In particular, the seal 204 of the skirt 200 operates on the outersurface of the end portion 184 of the tube 18 at a sealing distance Hfrom the outlet mouth 20, wherein said sealing distance H is less thanthe division distance H2 of the second dividing line L2 from the outletmouth 20.

This allows the sealing between the skirt 202 and the outer surface 18 eof the tube 18 to be achieved on a smooth surface, without dividinglines which could compromise the sealing itself, to the advantage ofmaintaining said seal.

Preferably, moreover, the thread 22 is made on the lower portion 182 ofthe tube 18.

Innovatively, this allows an excellent seal to be obtained between thesacrificial closure and the spout tube, and to preserve it for thesubsequent steps of the production process.

It is clear that a man skilled in the art may make changes to theinvention described above in order to meet incidental needs, all fallingwithin the scope of protection defined in the following claims.

1. An assembly comprising: a thin-walled flexible package provided witha spout comprising a connection portion and a tube having an outersurface and ending with an outlet mouth; a sacrificial closure appliedto the spout to close the outlet mouth, wherein said sacrificial closurecomprises a skirt suitable for sealingly engaging the outer surface ofthe tube at a sealing region having a sealing distance from the outletmouth; wherein on the outer surface of the tube there is acircumferential dividing line having a division distance from the outletmouth, said dividing line being contained in an annular band of theouter surface, said band being free of projections and divided by saidband into an upper band, towards the outlet mouth, and a lower band, onthe opposite side; and wherein said sealing distance is less than thedivision distance; wherein said dividing line divides the tube into alower portion and an end portion provided with the outlet mouth, whereinthe skirt engages the end portion; wherein the spout comprises a thread,protruding from the outer surface of the tube, entirely contained in thelower portion.
 2. The assembly according to claim 1, wherein the skirtof the sacrificial closure comprises a lip seal, protruding radiallyinternally, operating on the outer surface of the tube in said sealingregion.
 3. The assembly according to claim 1, wherein the sacrificialclosure is reversibly applicable to the spout.
 4. The assembly accordingto claim 1, wherein the sacrificial closure is irreversibly applicableto the spout.
 5. (canceled)
 6. (canceled)
 7. A method of manufacturing aclosure assembly comprising a spout and a sacrificial closure,comprising the steps of: making the spout through the followingsub-steps: providing a mold provided with a first half-cavity and acounter-mold provided with a second half-cavity; joining the firsthalf-cavity and the second half-cavity and thus obtaining a first cavitycorresponding to a first portion of the spout, said first portioncomprising a connecting portion and a lower portion of a tube; aproviding an insert suitable for cooperating with the mold and thecounter-mold to obtain a second cavity, corresponding to a completeannular wall for making a second portion of the spout, said secondportion corresponding to an end portion of the tube, adjacent to thelower portion, having an outlet mouth, said end portion having an axiallength equal to a division distance; making the sacrificial closureprovided with a skirt provided with a lip seal, protruding radiallyinternally from the skirt, suitable for operating on an outer surface ofthe tube; applying the sacrificial closure to the tube to close theoutlet mouth, so that the seal engages the outer surface in a sealingregion having a sealing distance from the inlet mouth, wherein thesealing distance is less than the division distance.